The New York Times looks into which option is better to help sleepy drivers stay alert: a nap or a cup of joe. In a study conducted by French researches to determine which better helped drivers avoid crossing the center line, it looks like coffee wins out, but how well it works depends on your age.

For middle-aged drivers, aged 40 to 50, coffee was a far better choice. Caffeinated coffee lowered risk for these drivers by 89 percent, while the nap only reduced line crossings by 23 percent. But among younger drivers, a nap was almost as effective as caffeine. Among 20- to 25-year-old drivers, the risk of line-crossing fell by 66 percent after a nap, and 74 percent after drinking caffeinated coffee.